Damper-regulator for steam-boilers.



C.. R. NELSON.

DAMPER REGULATOR FOR STEAM BOILERS.

APPLICATION FILED MAY 5. 1912.

Patented Dec. 24, 1918 2 SHiETS-SHEET I.

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C. R. NELSON.

DAMPER REGULATOR FOR STEAM BOILERS.

APPLICATION FILED MAY 5. 1911.

Patented Dec. 24, 1918.

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CHARLES ROLLIN NELSON, OF PORTLAND, MAINE.

DAMPER-REGULATOR FOR STEAM-BOILERS.

Specification of Letters Patent.

Patented Dec. 24, 1918.

Application filed May 5, 1917. Serial No. 166,731.

To all whom it may concern:

Be it known that 1, CHARLES RoLLIN NEL- SON, a citizen of the United Stat-es, residing at Portland, in the county of Cumberland and State of Maine, have invented certain new and useful Improvements in Damper- Regulators for Steam-Boilers, of which the following is a specification.

My invention relates to a damper regulator for steam boilers and particularly for heating boilers.

The object of the invention is to construct a regulator which shall be adapted for both high and low pressures and which shall be sensitive of action and simple in construction.

The important features of my invention are a tank filled with liquid and suspended by pivots through which steam enters from the boiler. A balance tank is connected with the liquid tank at one side thereof and above the level of the liquid in the liquid tank, so that the liquid may be forced by steam pressure from the liquid tank into the balance tank and allowed to run back from the latter when the pressure is reduced, thus efiecting an interchange of the liquid from one tank to the other, as the boiler pressure rises and falls. The tanks are so balanced that this interchange of liquid causes the structure to tilt .or rotate on the pivot and this tilting action is relied upon to operate the damper or dampers. The tank is tilted at high pressures by a pressure diaphragm such as is commonly used, the lever of the diaphragm being so connected as to effect the tilting of the structure mechanically when the diaphragm comes into action. A regulating counterweight is used which can be set for any pressure and the position of this weight on its'weight arm determines whether the high pressure with the diaphragm or the low pressure with the balancing bodies of liquid shall be used.

'My invention may be more readily understood by means of the accompanying drawing in which is represented a form of the invention well adapted for its purpose.

In the drawing,

Figure 1 is a side elevation.

Fig. 2 is a section taken on the line 1-1 of Fig. 1.

Fig. 3 is a section taken on the line 2-2 of Fig. 1.

, Fig. 4: is an elevation of a modification and Fig. 5 is an elevation partly in section showing the main vertlcal pipe commun1 eating with the diaphragm valve and its adjacent parts.

Theaction of the apparatus depends on the tilting of a closed liquid tank suspended pivotally from a hanger and connected with a balance tank at its side, so that liquid may pass back and forth between the two.

As here shown, 1 make use of a closed tank 3 made in two parts which are secured together by flanges. The tank is cylindrical and the lower portion 4: is elongated and of much smaller diameter than the upper portion.

A pipe 5 extends from a point near the bottom of the tank up through the upper end and terminates in a pressure diaphragm 6 of the usual type with its operative lever 7.

The tank 3 is pivoted at its upper end to a hanger 10 which has downward projection ears 8 and 9 through which the pivots pass on which the tank swings.

A steam pipe 12 which connects with the furnace enters the top of the tank 3 through the pivot 11. The hanger 10 is suspended from the ceiling or some overhead structure by posts 13.

The tank 3 is designed to be filled with water or other suitable liquid which will, under steam pressure he forced out into the balancing tank 1A which is located at oneside of the tank 3 and above the level of the liquid in the tank 3. The tank 14: is preferably twice the diameter of the lower portion of the tank 3 and of substantially the same diameter as the upper portion. It is here shown as a cylindrical tank and closed except that it has at its top an air valve 15 which allows air to pass in or out as the water level in the tank varies, but prevents the escape of water under any circumstances.

A pipe 16 extends from the bottom of the tank 14 horizontally through the side of the tank 3 and there connects with the vertical pipe 5. There is thus formed a liquid duct extending from the lower portion of the tank 3 to the bottom of tank 1 1, so that when steam pressure is put on the surface of the liquid in tank 3, the liquid is forced through pipes 5 and 16 into the tank 14: at the same time being forced up through pipe 5 to the diaphragm 6. The diaphragm is, however, set so that the low pressures will not move it and so that the low pressures on the water in tank 3 will only eifect the balance between the two tanks 3 and 14 causing the tank 14 to rise or sink according to the amounts of water held at any given time by each.

The apparatus is so connected with the furnace draft, that any tilting motion will operate the draft. As here shown an arm 17 is hinged at the base of tank 14, so that it may be swung around to come directly over the draft 19. A chain 18 connects the arm with the draft and a lever 20 and counter weight 21 connect by means of a chain 22 with the chain 18 whereby the weight of the draft is counterbalanced and the work required of the regulator thereby reduced and the regulation made more sensitive.

The structure is tilted at high pressures by means of the pressure diaphragm. For this purpose, the diaphragm lever 7 is connected by means of a link 23 with an arm 24 projecting out from a cam 25. This cam is pivoted to ears 26 which are secured to the hanger 10. The cam 25, as here shown has a vertical face with a rounded upper operative end 27. When the arm 24 is depressed, the operative end strikes an abutment which is connected with the pipe 5, and swings the upper portion of the structure forward on its pivot, in the same direction as the depression of the tank 14 swings it. The abutment against which the point of the cam strikes is angular and has a downward projecting arm 28 which lies normally directly in front of the cam 25. The abutment 28 extends out from a suitable fitting 29 on that portion of the pipe 5 which extends above the tank 3.

A counter-weight is provided for counterbalancing the weight of the tank 14 and the pull of the cam 25 tending to rock the structure to open the draft. As here shown a weight-beam 30 is attached to the diaphragm 6 extending horizontally away from the tank 14 and on this beam slides the weight 31.

In Fig. 4, I have shown a form of my clevice where 14 indicates the balancing tank and 3' the liquid tank. The pipe 16 which connects the two tanks is independent of the pipe 5' on which the pressure diaphragm is located.

The operation of the device will be understood by what has been already said.

The tank 3, being filled with water and the tank 14 empty, the draft is held open by the weight of the tank 3 and the oounterweight 31 so long as there is no steam pressure on the surface of the water.

When the steam pressure gets above the predetermined amount as indicated by the position of the weight on the beam, the steam pressure drives the water down through the lower end of pipe 5 and thence through the pipe 16 into the tank 14. The weight thus added to the tank 14 overbalances the weight 31 and the tank 14 with its arm 17 falls, thus closing the draft. It will be understood that the Weight 21 nearly counter-balances the weight of the draft and that very little force is required to open and close it.

The area of the lower end of the tank 3 being small, the water displaced in it and transferred into the tank 14 readily overcomes the inertia of the tank 3. This is true since slight additions to the weight of the tank 14 have a ready tendency to swing back the tank 3, on account of the considerable leverage caused by the offset of the tank 14. The device is thus very sensitive on low pressures and will operate on variations of fractions of an ounce in the steam pressure.

On the higher pressures, the weight is slid out nearer the end of the beam and as a consequence, the weight 31 will hold the tank 14 in its upper position when it is entirely full of water. In this case, the water is forced up against the diaphragm, the outer end of the lever 7 is depressed forcing outward the operative upper end of the cam 25 which strikes the abutment 28 and swings the structure on its pivot, closing the draft.

Such a regulating device as I have described is exceedingly sensitive on low pressures and when the pressure rises, the regulation automatically shifts, acting on the same general principle as the ordinary steam damper regulator.

I claim:

1. In a damper regulator for steam boilers, the combination of a liquid tank having an enlarged upper portion and a relatively contracted lower portion, said tank being pivotally supported at its upper portion and connected with the boiler through one of its pivots, a balancing tank of larger diameter than the lower portion of the liquid tank at one side of said liquid tank and above the level of the liquid therein, a duct connecting the lower portion of said liquid tank with the bottom of said balancing tank, an operating connection with the damper to work the same by the tilting of the liquid tank onits pivot and a counterweight for counter-balancing said balancing tan 2. In a damper regulator, the combination of a closed liquid tank, a hanger from which said tank is pivotally suspended, said tank being connected with said boiler through the pivot, a balancin tank at one side of said liquid tank and a ove the level of the liquid in said liquid tank, a duct extending from the lower portion of the liquid tank to the bottom of the balancing tank, a counter-weight for counter-balancing said balancing tank, means connecting with the damper for operating the same by tilting of the liquid tank, a pressure diaphragm 011 the top of said liquid tank and operated by pressure within the liquid tank, a lever operatively connected therewith and means operated by said lever for rotating the liquid tank and its connecting parts on said pivot whereby the tanks may be rotated and the damper operated by the balancing of the two tanks for low pressure and by the dia phragm for high pressure 3. In a damper regulator, the combination of a closed liquid tank, a hanger from which said tank is pivotally suspended, said tank being connected with the boiler through the pivot, a balancing tank at one side of said liquid tank and above the level of the water therein, a duct leading from the lower portion of the liquid tank to the bottom of said balancing tank, means connected with the damper for operating the same by the tilting of the liquid tank, a counter-weight for counterbalancing said balancing tank, a pressure diaphragm connected to the top of said liquid tank and operated by pressure within the liquid tank, a diaphragm lever thereon, a cam, pivoted to said hanger having a projecting arm, a link connecting said arm with said diaphragm lever and an abutment connected with said liquid tank, positioned adjacent to the cam and so arranged that the lifting of the diaphragm will tilt the liquid tank and its connected parts.

a. In a damper regulator, the combination of a closed liquid tank, a hanger from which said tank is pivotally suspended, said tank being connected with the boiler through the pivot, a balancing tank at one side of said liquid tank and above the level of the water therein, a duct leading from the lower portions of the liquid tank to the bottom of said balancing tank, means connected with the damper for operating the same by the tilting of the liquid tank, a counter-weight for counter-balancing said balancing tank, a pressure diaphragm connected to the top of said liquid tank and operated by pressure within the liquid tank, a diaphragm lever thereon, a cam, pivoted to said hanger having a projecting arm, a link connecting said arm with said diaphragm lever and an abutment between said liquid tank and said diaphragm having a contact surface in front of the surface of said cam and positioned to contact with the same when the diaphragm lever is depressed.

5. In a damper regulator, the combination of a closed liquid tank, a hanger from which said tank is pivotally suspended, said tank being connected with the boiler through the pivot, a balancing tank at one side of said liquid tank and above the level of the water therein, a duct leading from the lower portion of the liquid tank to the bottom of said balancing tank, means connected with the damper for operating the same by the tilting of the liquid tank, a pressure diaphragm connected to the top of said liquid tank and operated by pressure within the liquid tank, a diaphragm lever thereon, a cam pivoted to said hanger, having a projecting arm, a link connecting said arm with said diaphragm lever, a weight beam on said diaphragm, a counter-weight on said beam and an abutment connected with said liquid tank positioned adjacent to the cam and so arranged that the'lifting of the diaphragm will tilt the liquid tank and its connected parts.

In testimony whereof I hereby aifiX my signature.

CHARLES ROLLIN NELSON.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, D. 0. 

